Skip to main content


Buy Article:

$9.50 plus tax (Refund Policy)

Or sign up for a free trial

This paper illustrates the importance of modeling digester process behavior on predicting the overall performance of a BNR process. Of particular importance is the impact of ammonia and phosphorus recycled from digested solids handling back to the liquid train. The analysis uses the General Activated Sludge – Digestion Model (ASDM) that was developed and implemented in BioWin™ 2.1. Key aspects of the model include the consideration of ammonia and phosphorus release during hydrolysis and decay in the digester, and the inclusion of precipitation reactions for the formation of struvite and calcium phosphates. Simulation cases indicated that a significant amount of the nitrogen and phosphorus released in the digester may be incorporated in the precipitates, resulting in a substantial reduction in ammonia and phosphate concentrations in solids processing recycles such as solids dewatering filtrates. Published data from the York River, Virginia WWTP BNR demonstration study were used to illustrate that the recycled phosphate can have a significant impact on biological phosphorus removal performance, and that a comprehensive activated sludge anaerobic digestion model can allow a plant-wide simulation to examine this impact.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Document Type: Research Article

Publication date: 2004-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    A subscription to the Proceedings of the Water Environment Federation includes access to most papers presented at the annual WEF Technical Exhibition and Conference (WEFTEC) and other conferences held since 2000. Subscription access begins 12 months after the event and is valid for 12 months from month of purchase. A subscription to the Proceedings of the Water Environment Federation is included in Water Environment Federation (WEF) membership.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access. Access begins 12 months after the conference or event
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Learn about the many other WEF member benefits and join today
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more